Nomenclature for the C60-Ih and C70-D5h(6) Fullerenes
(IUPAC Recommendations 2002)

Fu-5. Heterofullerenes

Continued from Fu-4.

Contents of this section


Fu-5. Heterofullerenes

Fu-5.1. Skeletal replacement ('a') nomenclature for fullerenes

Fullerenes in which carbon atoms have been replaced by heteroatoms having standard bonding numbers or by bonding numbers indicated by the &lamda;-convention (ref. 7) are named by citing the 'a' prefixes of skeletal replacement nomenclature (ref. 8a) in front of the name of the fullerene.

The parent name is fullerene if double bonds are present or are possible in the fullerene; if double bonds are not possible the parent name is fullerane. This is illustrated by the dodecaaza(C20-Ih)[5]fullerane and dodecaaza(C20-Ih)[5]fullerene structures shown below.


1,2,4,6,7,9,11,12,14,16,18,20-Dodecaaza(C20-Ih)[5]fullerane


1,2,3,4,7,8,13,14,17,18,19,20-Dodecaaza(C20-Ih)[5]fullerene

Note. The double bonds in this structure are for illustrative purposes only. Double bonds are not shown in fullerenes, fulleroids, or fullerene component structures elsewhere in this report.
The heteroatoms include all elements capable of being tricoordinate, including metals and semimetals; no heteroatoms have attached hydrogen atoms. All carbons atoms of a fullerene may be replaced by the same or by different heteroatoms. Replacement of carbon atoms by trivalent heteroatoms may result in the need for indicated hydrogen.

Examples:


Sila(C60-Ih)[5,6]fullerene


2H-1-Aza(C60-Ih)[5,6]fullerene


1-Aza-9-bora(C60-Ih)[5,6]fullerene


1,9,13,14,19,20,41,42,47,48,52,60-Dodecasila(C60-Ih)[5,6]fullerene


Heptacontasila(C70-D5h(6))[5,6]fullerene


1&lamda;4-Thia(C60-Ih)[5,6]fullerene


Azonia(C60-Ih)[5,6]fullerene


Rhoda(C60-Ih)[5,6]fullerene

Fu-5.2. Skeletal replacement ('a') nomenclature for structurally modified fullerenes.

When 'homo', 'nor', 'cyclo', or 'seco' co-occur with replacement terms, such as 'aza' and 'oxa', the replacement prefixes are cited in order of their senority in front of any structure modifying prefixes. Structure modifying prefixes have preference over replacement prefixes for low locants.

Examples:


1aH-1a-Aza-1(9)a-homo(C60-Ih)[5,6]fullerene


9-Oxa-2,5-diaza-1-nor(C60-Ih)[5,6]fullerene


1aH-1a-Aza-1,9-seco-1(2)a-homo(C60-Ih)[5,6]fullerene


1a&lamda;2-Germa-1(9)a-homo(C60-Ih)[5,6]fullerene


24a-Oxa-24(25)a-homo(C70-D5h(6))[5,6]fullerene


7aH,46aH,53aH-7a,46a,53a-Triaza-7(22)a,46(47)a,53(54)a-trihomo(C70-D5h(6))[5,6]fullerene


2,5,8,10-Tetraoxa-51,53,56,59-tetraaza-1,9,52,60-tetranor(C60-Ih)[5,6]fullerene


Reference for this section

7. International Union of Pure and Applied Chemistry. Division of Organic Chemistry. Commission on Nomenclature of Organic Chemistry, "Treatment of Variable Valence in Organic Nomenclature (Lambda Convention) (Recommendations 1983)". Pure Appl. Chem. 1984, 56, 769-778.

8. International Union of Pure and Applied Chemistry. Division of Organic Chemistry. Commission on Nomenclature of Organic Chemistry, A Guide to IUPAC Nomenclature of Organic Compounds, Recommendations 1993, Blackwell Scientific Publications, Oxford, 1993: (a) Appendix, R-9.3, Table 33, p. 182; (b) R-2.4.4, Ring Assemblies, pp. 53-55; (c) R-0.2.4.2, Lowest set of locants, p. 17.


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